At my job, we have 1577 Callable type hints scattered in 1063 Python files. For comparison, this codebase also has 2754 dict annotations and 1835 list ones.
On Mon, Dec 20, 2021 at 8:11 AM Christopher Barker <[email protected]> wrote: > note: I wasn't thinking -- typeshed, of course, has a lot more than the > standard lib. But it's still a collection of widely used somewhat general > purpose libraries. So I think my hypothesis is still valid. > > -CHB > > > On Sun, Dec 19, 2021 at 8:54 PM Christopher Barker <[email protected]> > wrote: > >> A question that came up for me is: >> >> How common is it to need to use Callable for type hints? particularly >> complex versions, specifying what parameters the Callable takes? A more >> compact and easier to read syntax is nice, but not very important if it >> isn't used much. >> >> My first thought on this was that I can't remember a single time that I >> wrote production code that took a Callable as a function parameter -- or >> returned one -- OK maybe a few times, but it's certainly rare in my >> production code. >> >> So I looked in the PEP to see if that issue was addressed, and indeed it >> is: >> >> "The Callable type is widely used. For example, as of October 2021 it was >> the fifth most common complex type in typeshed," >> >> That did surprise me, but on thinking about it, maybe not so much. It >> strikes me that Callable is most likely to be used in fairly low level, >> general purpose functions, like map(), sort(), various functions in >> itertools, etc. Just the sort of functions that are common in the standard >> library, but may not so much in production code. >> >> I have no idea how to evaluate how common it is in production code -- >> maybe type hinting is common enough now that PyPi could be searched -- but >> even PyPi is a biased sample, as it is full of, by definition, >> libraries for others' use -- i.e. general purpose tools (less general that >> the stad lib, but still not specialty production code, which I suspect is >> the majority of Python code out there). >> >> Perhaps some folks that have been type=hinting their production code >> bases could provide anecdotal evidence. >> >> Anyway, if my hypothesis is correct, then it's not so bad that >> not-so-nice syntax is required to type hint general purpose utilities. >> >> -CHB >> >> -- >> Christopher Barker, PhD (Chris) >> >> Python Language Consulting >> - Teaching >> - Scientific Software Development >> - Desktop GUI and Web Development >> - wxPython, numpy, scipy, Cython >> > > > -- > Christopher Barker, PhD (Chris) > > Python Language Consulting > - Teaching > - Scientific Software Development > - Desktop GUI and Web Development > - wxPython, numpy, scipy, Cython > _______________________________________________ > Python-Dev mailing list -- [email protected] > To unsubscribe send an email to [email protected] > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/[email protected]/message/LWIXFDUGRM6Z3KHI3YGV65HWXRD2S4H5/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Thanks, Andrew Svetlov
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